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Article Details


Evaluation of B Lymphocyte Deficiencies

[ Vol. 13 , Issue. 2 ]

Author(s):

John D. Vickery, Christie F. Michael and D. Betty Lew   Pages 133 - 143 ( 11 )

Abstract:


The most common of the primary immunodeficiency diseases are those that involve inadequate antibody production. The characteristic presentation of these disorders is recurrent sinopulmonary infections. An arrest in B cell development at the pre-B cell stage leads to agammaglobulinemia and an insignificant number of B cells. X-linked agammaglobulinemia is the most common of these developmental arrests while the autosomal recessive agammaglobulinemias comprise a small minority of the total cases. Likewise, the most common form of the hyper-IgM syndromes (CD40 ligand deficiency) is X-linked. Of the autosomal recessive forms, CD40 deficiency is basically identical to the X-linked form in its clinical phenotype where, in addition to inadequate antibody production, there is defective T cell signaling through the CD40-CD40L interaction. Aside from CD40 deficiency, the other recessive forms of hyper-IgM syndrome have adequate T cell function. IgA deficiency is the most common and the most benign of the B cell disorders. Common variable immunodeficiency is diverse in its presentation and clinical course. The pathophysiology of this disease is multifactorial and frequently ill defined, often making it a diagnosis of exclusion. A working knowledge of identifiable PIDDs is essential in both recognizing when to suspect immunodeficiency and making a diagnosis.

Keywords:

B lymphocyte, antibody, deficiencies, clinical evaluation.

Affiliation:

, , The Children's Foundation Research Center; and Department of Pediatrics, College of Medicine, University of Tennessee, Memphis, Tennessee, USA.



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